# Math 22 The Three-Dimensional Coordinate System

 The distance ${\displaystyle d}$ between the points ${\displaystyle (x_{1},x_{2},x_{3})}$ and ${\displaystyle (x_{2},y_{2},z_{2})}$ is
${\displaystyle d={\sqrt {(x_{2}-x_{1})^{2}+(y_{2}-y_{1})^{2}+(z_{2}-z_{1})^{2}}}}$